Effect of carbides on the creep properties of a Ni-base superalloy M963

被引：146
作者：
He, LZ [1 ]
Zheng, Q
Sun, XF
Guan, HR
Hu, ZQ
Tieu, AK
Lu, C
Zhu, HT
机构：
[1] Chinese Acad Sci, Inst Met Res, Dept Superalloys, Shenyang 110016, Peoples R China
[2] Univ Wollongong, Sch Mech Mat & Mechatron, Wollongong, NSW 2522, Australia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2005年 / 397卷 / 1-2期
关键词：
M963 Ni-base superalloy; Creep; Carbides;
D O I：
10.1016/j.msea.2005.02.038
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Effect of carbides on the creep properties of a cast Ni-base superalloy M963 tested at 800 and 900 degrees C over a broad stress range has been investigated. Correlation between the carbides and creep properties of the alloy is enabled through scanning electron microscopy (SEM) and transmission electron microscopy (TEM). During high temperature creep tests, the primary MC carbide decomposes sluggishly and a large amount of secondary carbides precipitate. The cubic and acicular M6C carbide precipitates at the dendritic core region. Extremely fine chromium-rich M(23)C6 carbide precipitates preferentially at grain boundaries. The M6C and M23C6 carbides are found to be beneficial to the creep properties of the alloy. At lower temperature (800 degrees C), the interface of MC carbide with matrix is one of the principal sites for crack initiation. At higher temperature (900 degrees C), the oxidation and the precipitation mu of phase are the main factors for significant loss in creep strength of the alloy.
引用
收藏
页码：297 / 304
页数：8
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